Algorithm of JPEG in Photoshop - a site Web (Apache) environment

I don't know if this is the right forum for this post, but none of the others seemed to agree.  Here's my situation: I'm the programmer for a Web site that manages the images.  I need to change the images "on the fly", and I did what needs to be done using a php module called GD2.  The problem is the following: JPEG images saved, even when recording quality = 100, are no match for the images as recorded via photoshop. The Web site running php under Apache code in a Linux environment.

So, my question is this: what image manipulation tool is put at my disposal in this environment (php, Apache, Linux) using the algorithm of writing of JPEG in photoshop?

Original image created by photoshop:

Photoshop.jpg

Image resulting simply read / save 100% in GD2.

php_gd2.jpg

FYI, I also opened the image with IrfanView, and recorded at 100%, the results are a close match to what I got from GD2.

So, my question is this: what image manipulation tool is put at my disposal in this environment (php, Apache, Linux) using the algorithm of writing of JPEG in photoshop?

None.

You need to run Photoshop to use Photoshop JPEG code.

Photoshop does not use a JPEG of open source library.

However, you should be able to get much closer than that - looks like someone made up the quality WAY down on the version that you saved.

Specifically, your version has the excessive chroma subsampling.

Tags: Photoshop

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